Ms Sweettooth Always Consumes Iced Tea and Sugar in Fixed

Multiple Choice

Ms. Sweettooth always consumes iced tea and sugar in fixed proportions: 8 ounces of iced tea to 3 teaspoons of sugar. This implies that for Ms. Sweettooth the marginal rate of substitution of iced tea for sugar is:

A) 0.375.
B) 2.67.
C) diminishing but between 8 and 3.
D) undefined.